docs: def get_std_dev_area(self, mag, rake):
          """
          Standard deviation for WC1994. Magnitude is ignored.
          """
          assert rake is None or -180 <= rake <= 180
          if rake is None:
              # their "All" case
              return 0.24
          elif (-45 <= rake <= 45) or (rake >= 135) or (rake <= -135):
              # strike slip
              return 0.22
          elif rake > 0:
              # thrust/reverse
              return 0.26
          else:
              # normal
              return 0.22